Crimping or indenting tool



April 2, 1968 D. ARNoLb 3,375,697

CRIMFING OR INDENTING TOOL Filed Oct. 24, 1965 4 Sheets-Sheet l INVENTOR. DOUGLAS ARNOLD /@1 24: 65. fiocwe/l April 2, 1968 D. ARNOLD CRIMPING OR INDENTING TOOL 4 Sheets-Sheet :3

Filed Oct. 24, 1965 R. m E V m 13006445 ARA/0L0 6 April 2, 1968 D. ARNO LD CRIMPING OR INDENTING TOOL 4 Sheets-Sheet Filed Oct. 24, 1965 RmM 0 Y m m M W E An 2 V 0 a J U a i m B m April,2,1968 DARNOLD 3,375,697

CRIMPING OR INDENTING TOOL 4 Sheets-Sheet 4 Filed Oct. 24, 1965 INVENTOR. DOUGLAS 142N040 .47'ra2A/EY United States Patent Office 3,375,697 Patented Apr. 2,, 1968 3,375,697 CRIMPING R INDENTING TOOL Douglas Arnold, Meriden, Conn., assignor, by mesne assignments, to Sargent & Company, New Haven, Conn., a corporation of Delaware Filed Oct. 24, 1965, Ser. No. 504,477 11 Claims. (Cl. 72-402) This invention relates to an indenting or crimping tool well suited, but not limited, to crimping coupling elements on electrical wire to provide a strong physical and electrical connection between the wire and the element. The tool is also well suited for incorporation in a device operated by a pair of handles having a scissorslike action but is not limited to such an application.

One object of the invention is to provide a tool, such as characterized above, having an improved indenting or crimping head. A further object is to provide in such a head an improved locator and support for a coupling element. Another object is to provide a crimping or indenting tool having few parts and in which the parts serve a combination of functions, thereby tending to reduce the cost of the tool and improve it through simplification.

Still another object is to provide a crimping tool having at least one crimping jaw or die carrier provided with a die element movable relatively to the jaw between two extreme positions, which may be spring biased toward one of these positions and which may be cammed toward the other extreme position by a jaw element in the form of a pin which may rotate on its axis and have peripheral camming engagement with the movable die element. The construction is such that the cam pin has substantially line contact with the movable die element, tending to reduce friction between the parts. The pin also tends to provide a camming surface which wears uniformly.

The construction is also such that the movable die element may be easily biased in the aforesaid manner and easy access may be had to the pin for the replacement of the latter, if necessary. The construction of the tool is also such that the terminal and wire being worked upon by the tool may be viewed during a crimping operation. Furthermore, the tool may be so constructed that the work may be inserted into the tool between open ends of the jaws, that is, endwise of the jaws, as well as be inserted between the jaws by lateral or transverse movement relatively thereto. Further objects of the invention will be apparent from the following detailed description of two illustrated forms of the tool.

In the drawings:

FIG. 1 is a side elevational view of a tool embodying the invention illustrating the work-performing elements thereof in the fully open or separated positions thereof;

FIG. 2 is an exploded view of the head of the tool on a somewhat enlarged scale, certain parts being omitted for the sake of clarity;

FIGS. 3, 4 and 5 are fragmentary enlarged views in side elevation, partially broken away, illustrating the open, partially closed and fully closed positions, respectively, of the parts of the head of the tool;

FIG. 6 is a sectional view taken on line 66 of FIG. 5;

FIG. 7 is a further enlarged, fragmentary view in side elevation of the dies of the tool in fully closed positions; and

FIG. 8 is a diagrammatic and broken view, similar to FIG. 5, illustrating a modification of the tool.

In the drawings, the tool is shown, by way of example only, as being of the hand-operated type, that is, with reference to the form of FIGS. 1 through 7 as comprising handle elements, indicated generally at 10 and 11, piv0tal- 1y interconnected, as at 12, and having insulated hand grip portions 13 by which the handles may be manipulated in a scissorslike action to operate the tool. To assure full closing of the dies of the tool in operation, the handles are preferably provided with a motion-compelling mechanism comprising a ratchet element 14 and a cooperating element 15. The illustrated motion-compelling mechanism of the type described and claimed in copending application, Ser. No. 453,742, filed May 6, 1965, now Patent No. 3,277,751, assigned to the same assignee. As best shown in FIG. 1, the handle 10 is pivoted by means of a pin 16 to one end of an elongated jaw element indicated generally at 17. The handle 11 is: similarly connected to one end of a cooperating elongated jaw element indicated generally at 18.

The jaw elements are located relatively to one another by a pin 19 intermediate the ends of the elements, the pin 19 having portions thereof received in complemental, opposed recesses in the elements, and the pin 19 being held captive therein by plate parts 20 which are best shown in FIG. 2. These plate parts are disposed at opposite sides of the cooperating jaw elements and in alignment with one another. They are maintained in place by pivot pins 21 extending through the plate parts and through the respective jaw elements in a manner best indicated in FIG. 2. The pins 21 may be held against axial dislocation by suitable heads 21a formed on the pins, indicated in the last-mentioned view, and by snap rings 21b, indicated in FIG. 1. The pins 12 and 16, previously referred to, may also be held against axial dislocation in similar fashion. The handles of the tool may be biased to their open positions by a spring indicated at 22 in the manner described in the aforementioned copending application, and the motion-compelling mechanism may form a stop limiting closing movement of the handles and may have adjustment means, all as shown and described in the aforementioned copending application.

The jaw element 17 comprises (FIG. 2) a plate part 25, serving as a support through which the companion pivot 16 extends, and the companion pivot 21. The plate part 25 overlies a die carrier 26 of the jaw element, which part is also generally of platelike form through which the last-mentioned pivot pins also extend, the plate parts 25 and 26 having edge portions thereof suitably recessed in alignment with one another for cooperation with the aforementioned pin 19.

The die carrier 26 has on an edge portion thereof a die which in the illustrated form is integral and in the shape of a tooth indicated at 27, and the part 26 is recessed as at 28 to provide a cavity receiving a platelike movable die 29 which has a die tooth, indicated at 30, formed on an edge portion thereof, the tooth 30 being formed on .a portion of the plate part 29 projecting from the cavity 28 generally toward the jaw 18, the lastrnentioned portion projecting beyond the die carrier 26 and the support plate 25.

The die element 29 is maintained captive in the recess 28 of the die carrier 26 by the support plate and is mounted in the cavity for pivotal movement by means of a pin 32 (FIG. 1) extending through a hole in the die element 29 and complemental holes formed in the support plate 25 and the die carrier 26. One edge portion of the platelike die carrier forms in part the die tooth 27 and converges with a cam edge portion 34 of the die carrier which is provided with a bore breaking transversely therethrough to receive a cam pin 35 axially retained in place as by snap rings. The pin 35, preferably being rotatable in the bore, presents a portion of its circular periphery for engagement by a movable die element 37, similar to the die element 29, carried by the jaw element 18.

The jaw element 18 comprises a plate part 38 similar to the plate part previously described, but not identical thereto, and providing a support through which the companion pivot 16 extends and the companion pivot 21. The plate part 38 overlies a die carrier 39 of the jaw element which is generally similar to the die carrier 26 previously described, through which the last-mentioned pivot pins extend, the aforesaid parts 38 and 39 having edge portions thereof suitably recessed in alignment with one another for cooperation with the aforementioned pin 19.

The die carrier 39 has on an edge portion thereof a die which in the illustrated form is integral and in the shape of a tooth, indicated at 40, and the part 39 is recessed at 42 to provide a space receiving the movable die element 37 which also has a die tooth indicated at 43 formed on an edge portion thereof, the tooth 43 being formed on a portion of the plate part 37 projecting beyond the die carrier 39 and the support plate 38 generally toward the jaw 17.

The die element 37 is maintained captive in the recess 42 of the die carrier 39 by the support plate and is mounted therein for pivotal movement by means of a pin 46 (FIG. 1) extending through a hole in the die element 37 and complemental holes formed in the support plate 38 and the die carrier 39. One edge portion of the platelike die carrier 39 forms in part the die tooth and converges with a cam edge portion 44 of the die carrier which is provided with a bore breaking transversely therethrough to receive a cam pin 45 axially retained in place as by snap rings. The pin 45, preferably being rotatable in the bore, presents a portion of its circular periphery for engagement by the aforementioned movable die 29 carried by the jaw element 17 The jaws of the tool are moved toward their open positions shown in FIG. 1 as the handles of the tool are separated in a scissorslike movement. The aforementioned spring 22, acting on the handles, tends to separate them. A hair spring 47 extends between the movable die elements 29 and 37, tending to separate or urge these elements toward their open positions shown in FIG. 1. The spring 47 is supported by having one end thereof snugly fitted in a hole in the element 29 and the other end similarly received in a hole in the element 37. Thus, the die elements, movable relatively with respect to the companion jaws, are biased by a single spring which may be easily removed for replacement, if necessary. The lastmentioned die elements are also readily accessible for replacement.

The cam pin 45, aside from its function of camming engagement with the movable die element 29, has a further function which resides in its cooperation with the work support and locator shown to advantage in FIG. 6 and indicated generally at 48. The support and locator 48 comprises a lever 49 (FIG. 2) pivoted, as at 50 (FIG. 6), at one end thereof to the die carrier 26 by a suitable pin readily accessible at an exposed portion of the latter, which pin may be held against axial displacement as by split rings at its respective end portions. Intermediate the ends thereof the lever 49 is provided with an opening 52 (FIG. 2) for a purpose which will appear hereinafter, and at the end portion thereof, remote from the first-mentioned end of the lever 49, the latter is provided with a slot 53, best shown in the lastmentioned view, which receives one end of the cam pin 45. It will be understood that axial dislocation of the pin 45 with reference to the lever 49 is prevented by the aforementioned snap rings. The engagement of the pin 45 with the means defining the slot 53 in the lever controls pivotal movements of the lever 49 on the axis of its pivot 50 upon opening and closing movements of the handles controlling movements of the jaws.

Adjacent the pivot 50 the lever 49 is provided with an L-shaped lug 54 struck therefrom. At the end of the lever 49 remote from the pivot 50 there is provided on the lever a lug 55 (FIG. 6) having a slot 56 formed therein gen- 4 erally of keyhole shape and opening through the distal end of the lug 55. The L-shaped lug 54 of the lever supports the bight portion of a hairpin spring 57, best shown in FIG. 2, while the free ends of the spring are removably supported in the keyhole slot 56 of the lever. The intermediate portion of the spring supports a barrellike element 58, which in turn supports the work, the element 58 having a boss 60 thereon removably received in the aperture 52 of the lever, as shown in FIG. 6. As indicated in the last-mentioned view, the support element 58 has formed concentrically with the boss 60 a recess or opening which, when the support element 5-8 is assembled with the tool, may receive a terminal connector 61 having a suitable opening or bore therein to receive one end of an electrical wire 63 to which the connector is to be crimped by the tool as by indenting the connector 62 about the bared conductor portion 62 of the wire by the dies of the tool in the manner indicated in FIGS. 6 and 7.

The aforementioned means for removably securing the work-supporting barrel element 58 on the lever 49 permits the support on the lever 49 of any one of a series of barrellike work-supporting elements, each having formed therein a work-supporting receptacle of a different size and/or shape to accommodate various types and sizes of electrical terminal connectors. The construction is also such that the barrel elements may provide a receptacle in each end thereof for a diiferent type of connector, say male at one end and female at the other. The support for the barrel element 58 on the lever 49 is such that the retaining spring 57 may be released and the ends of the element 58 reversed with reference to the lever 49. As shown in FIG. 6, the end of the barrel element 58 remote from that received in the lever 49 is provided with a boss similar to the boss 60, for reception in the lever 49 when the barrel element 58 is reversed.

The barrel element 58 is removably maintained in position with reference to the tool by the hair-pin spring 57, as previously indicated. As indicated in FIGS. 2 and 6, the hair-pin spring may straddle the barrel 58 and engage in a peripheral groove 64 formed in the latter to support the barrel, the portions of the spring engageable with the barrel being of angular form, as indicated in FIG. 2.

The swinging axis and the slot 53 of the work support and locator 48 are so located and constructed with reference to the pivot points of the die elements of the tool that in the movements of the die elements, both of the fixed and movable type as aforesaid, the work tends to remain centered with reference to the dies during their opening and closing movements. The movements of the movable die elements 29 and 37 will be explained more fully hereinafter.

The operation of the form of tool shown in FIGS. 1 through 7 will be generally understood from the foregoing. The desired work-supporting barrel (corresponding with the type and size of connector) of the support and locator 48 is assembled in the manner previously described. The conductor is inserted in the terminal connector and the terminal connector placed in the receptacle formed by the barrel of the locator. The insertion of the work in the barrel may be by moving the terminal connector relatively laterally or transversely of the jaws until the terminal connector is fully seated in the barrel or by moving the terminal connector endwise relatively to the jaws between their open ends and then laterally or transversely to the jaws to fully seat the terminal connector in the barrel. It will be understood that the foregoing is accomplished when the jaws are open or in the condition shown in FIG. 1. The opening of the handles and jaws of the tool may be limited by an abutment 66 formed on the die carrier 26 and engagea-ble with an abutment 66a (FIG. 1) formed on the die carrier 39.

As the handles of the tool are swung toward one another in a scissorslike action or moved toward their closed positions from their open positions, the die elements of the tool move inwardly on the work in the manner shown in FIG. 4. As indicated in this view, the die elements 27 and 40 fixed to the respective jaws commence their indenting operation while the movable die elements 29 and 37 swing inwardly toward the work commencing their indenting operations, the last-mentioned die elements swinging on the pivotal axes of the jaws and also swinging on their respective pivots 32 and 46. The movement of the die elements 29 and 37 on the last-mentioned axes is effected through engagement of the cam pin 45 with the die element 29 along the edge 68 (FIG. 4) thereof, and the engagement of the cam pin 35 with the die element 37 along the edge 69 thereof, as shown in the last-mentioned view.

The pivotal action of the jaws previously described effects pivotal movement of the work support and locator 48 on its axis 50, controlled by the action of the pin 45 in the slot 53 formed in the lever 49 of the support and locator, the axis of the work tending to remain equidistant from the points or forward edges of the die teeth. As previously indicated, the cam pins 35 and 45 tend to roll over the cam surfaces of the movable die elements 29 and 37 during the aforementioned movement of the dies, and it may be noted that the movable dies 29 and 37, during the closing movement of the dies, contact only the cam pins of the respective jaws, thereby effecting substantially line contact at any given moment between each cam pin and the coacting movable die which it engages, tending to reduce friction and, through rolling movement of the cam pins, tending to effect uniform wear on the latter.

Upon continued closing movement of the handles and jaws of the tool, the swingable dies of the tool close farther on the work as the work support and locator also swing on its pivotal axis until the parts of the head of the tool assume the positions shown in FIG. 5 in which the connector is fully crimped. Until the last-mentioned positions of the parts are reached or the stop of the motioncompelling mechanism previously referred to rendered operative, the cooperation of the ratchet element 14 with the element 15 of the motion-compelling mechanism prevents separation of the dies once closing movement of the handles has commenced and the elements 14 and 15 of the motion-compelling mechanism engaged with one another. The operation of the aforementioned motioncompellin-g mechanism is fully described in the aforesaid copending application.

The handles and jaws of the tool may thereafter be separated or swung to their relatively open positions. It will be appreciated that during this movement of the jaws the movable die elements 2.9 and 37 tend to separate under the influence of the spring 47. When the dies clear the work, the latter may be removed from the support and locator 48. The action of the tool is such as to form. a strong physical and electrical connection between an electrical conductor and a terminal connector in the aforesaid manner.

The modified form of the tool shown in FIG. 8 is similar in some respects to the tool previously described. The form of FIG. 8 comprises jaws including a die carrier 70 corresponding generally to the die carrier 26 and a die carrier 71 corresponding generally to the die carrier 39, pivotally supported in similar fashion. The die carrier 70 differs in that it does not support a movable die element but comprises a fixed die 72 and, instead of carrying a cam pin, has an integrally formed cam edge portion 73 for cooperation with a cam nose 74 formed on an edge portion 74:: of a movable plate-like die element, indicated generally at 75, pivoted at 76 on the die carrier 71. The movable die element 75 is biased toward open position by a springbiased ball 77 carried in a suitable bore in the die carrier 71 and engageable with an edge portion of the movable die element 75, as indicated in FIG. 8. The lastmentioned die carrier has a fixed or integrally formed die 79. The movable die element 75 has an integral die 78.

The operation of the form of the tool shown in FIG. 8

will be understood from the foregoing. As the jaws of the tool move toward closed position in a manner similar to the previously-described closing movement of the jaws 17 and 18, the cam surface 73 of the die carrier engages the surface 74a of the movable die'element in such a manner as to force the die 78 of the element into the work in the manner indicated in FIG. 8, while the dies 72 and 79 in fixed relation to the die carriers 70 and 71, respectively, are also forced into the work. When the jaws are opened the dies separate, the separating movement of the die element '75 being effected by swinging movement of the die carrier 71 on its pivotal axis and also swinging movement of the element 75 on the axis of its pivot 76 under the influence of the spring-biased ball 77.

While only to forms of the invention have been illustrated and described, it will be apparent to those versed in the art that the tool may take other forms and is susceptible of changes in details without departing from the principles of the invention and the scope of the appended claims.

What is claimed is:

1. A crimping or indenting tool comprising a pair of jaws supported for angular movement relatively toward and away from one another and provided with means by which these movements may be effected, each jaw comprising a die carrier swingable on the axis of the jaw and provided with a die fixed thereto, said dies of the die carriers being in generally opposing relation to one another to move toward and away from the work with the jaws, at least one die carrier providing a pivotal support eccentric to its swinging axis for a movable die element, a movable die element on said support having a die thereon and swingable in a plane normal to the swinging axis of the last-mentioned die carrier and providing a cam surface, a cam mounted on the other die carrier and cooperating with said cam surface toeffect movement of the movable die element on its pivotal support in a direction toward the work as the jaws are swung on their pivotal axes in a closing direction, and means for moving the movable die element in the opposite direction on said pivotal support on opening movement of the aws.

2. A crimping or indenting tool as defined in claim 1 wherein said cam surface is provided by a cam nose provided on the movable die element cooperating with a complemental cam surface provided on said other die carrier,'the last-mentioned die carrier being provided with resilient means engageable with the die element urging the latter in said opposite direction.

3. A crimping or indenting tool as defined in claim 1 wherein a work support and locator is provided mounted on one of the jaws for swinging movement on an axis eccentric to the jaws swinging axis and that of said movable die element and having camming engagement with the other jaw to control its swinging action as the jaws are moved in their opening and closing directions, the support and locator being movable relatively to the jaws during their movements tending to maintain the work centrally disposed with reference to the dies.

4. A crimping or indenting tool as defined in claim 1 wherein said cam is constituted by a pin mounted in a bore breaking through an edge of the die carrier on which it is mounted so that the pin projects therefrom, the pin being restrained against axial dislocation but being loosely mounted in said bore so as to tend to be revoluble therein.

5. A crimping or indenting tool as defined in claim 1 wherein each die carrier provides a pivotal support eccentric to its swinging axis for a movable die element, a pair of movable die elements, one on each support and having a die thereon and swingable in a plane normal to the swinging axis of its die carrier and providing a cam surface, a pair of cams, one on each die carrier for cooperation with the cam surface of the movable die element on the other die carrier to effect movement of the lastmentioned die element on its pivotal support in a direction toward the work as the jaws are swung on their pivotal axes in a closing direction, and means for moving the movable die element in the opposite direction on said pivotal support on opening movement of the jaws.

6. A crimping or indenting tool as defined in claim 3 wherein the work support and locator comprises any selected one of a series of socketed work-supporting elements, each having a work-receiving socket of different dimensions, the last-mentioned element being removably supported on the locator.

7. A crimping or indenting tool as defined in claim 3 wherein the work support and locator comprises a worksupporting barrel providing at either end thereof a worksupporting receptacle of different dimensions, the barrel being removably supported on the locator in a manner such that the barrel may be reversed so that either selected receptacle may be arranged in the locator for receipt of the work.

8. A crimping or indenting tool as defined in claim 5 wherein said means for moving each movable die element in said opposite direction on said pivotal support on opening movement of the jaws is constituted by a single spring extending between the movable die elements.

9. A crimping or indenting tool as defined in claim 7 wherein said work support and locator comprises a lever pivotally supported at one end on the aforesaid swinging axis of the support and locator, having intermediate of its ends means defining a slot coacting with pin means received therein and supported from said other jaw for camming movement of said lever, the lever having at each end portion a lug, said support and locator further comprising a spring extending between and supported on said lugs and removably supporting intermediate of its ends a socketed work-receiving element, the lever having an opening therein intermediate of its ends removably receiving a portion of said socketed element.

10. A crimping or indenting tool comprising a pair of jaws supported for angular movement relatively toward and away from one another and provided with means by which these movements may be effected, each jaw comprising a die carrier swingable on the axis of the jaw and provided with a die fixed thereto, said dies of the die carriers being in generally opposing relation to one another to move toward and away from the work with the jaws, at least one die carrier providing a pivotal support eccentric to its swinging axis for a movable die element, a movable die element on said support having a die thereon and swingable in a plane normal to the swinging axis of the last-mentioned die carrier and providing a cam surface, a cam comprising a pin mounted Cir in a bore breaking through an edge of the other die carrier so that the pin projects therefrom, the pin being restrained against axial dislocation by being loosely mounted in said bore so as to tend to be revoluble therein and cooperating with said cam surface to effect movement of the movable die element on its pivotal support in the direction toward the work as the jaws are swung on their pivotal axes in a closing direction, means for moving the movable die element in the opposite direction on said pivotal support on opening movement of the jaws, and a work support and locator movable relatively to the jaws during their movements tending to maintain the work centrally disposed with reference to the dies comprising a lever pivoted on the jaw carrying said movable die element and having means defining a slot receiving for camming engagement therewith the cam pin, the lever also having means thereon for receiving, supporting and locating the work, the movement of said lever on its swinging axis on opening and closing movements of the jaws being controlled by the cam pin.

11. A hand tool comprising a pair of handles pivotally interconnected for relative swinging movement in a scissors-like action, jaws supported by the respective handles for angular movement relatively toward and away from one another, each jaw comprising a die carrier swingable on the axis of the jaw and provided with a die fixed theretO, said dies of the die carriers being in generally opposing relation to one another to move toward and away from the work with the jaws, at least one die carrier providing a pivotal support eccentric to its swinging axis for a movable die element, a movable die element on said support having a die thereon and swingable in a plane normal to the swinging axis of the last-mentioned die carrier and providing a cam surface, a cam mounted on the other die carrier and cooperating with said cam surface to effect movement of the movable die element on its pivotal support in a direction toward the work as the jaws are swung on their pivotal axes in a closing direction, and means for moving the movable die element in the opposite direction on said pivotal support on opening movement of the jaws.

References Cited UNITED STATES PATENTS 838,008 12/1906 Chanler et al. 72-410 2,079,498 5/1937 Douglas 72402 3,276,238 10/1966 Erdmann 72-4l0 CHARLES W. LANHAM, Primary Examiner.

R. D. GREFE, Examiner. 

1. A CRIMPING OR INDENTING TOOL COMPRISING A PAIR OF JAWS SUPPORTED FOR ANGULAR MOVEMENT RELATIVELY TOWARD AND AWAY FROM ONE ANOTHER AND PROVIDED WITH MEANS BY WHICH THESE MOVEMENTS MAY BE EFFECTED, EACH JAW COMPRISING A DIE CARRIER SWINGABLE ON THE AXIS OF THE JAW AND PROVIDED WITH A DIE FIXED THERETO, SAID DIES OF THE DIE CARRIERS BEING IN GENERALLY OPPOSING RELATION TO ONE ANOTHER TO MOVE TOWARD AND AWAY FROM THE WORK WITH THE JAWS, AT LEAST ONE DIE CARRIER PROVIDING A PIVOTAL SUPPORT ECCENTRIC TO ITS SWINGING AXIS FOR A MOVABLE DIE ELEMENT, A MOVABLE DIE ELEMENT ON SAID SUPPORT HAVING A DIE THEREON AND SWINGABLE IN A PLANE NORMAL TO THE SWINGING AXIS OF THE LAST-MENTIONED DIE CARRIER AND PROVIDING A CAM SURFACE, A CAM MOUNTED ON THE OTHER DIE CARRIER AND COOPERATING WITH SAID CAM SURFACE TO EFFECT MOVEMENT OF THE MOVABLE DIE ELEMENT ON ITS PIVOTAL SUPPORT IN A DIRECTION TOWARD THE WORK AS THE JAWS ARE SWUNG ON THEIR PIVOTAL AXES IN A CLOSING DIRECTION, AND MEANS FOR MOVING THE MOVABLE DIE ELEMENT IN THE OPPOSITE DIRECTION ON SAID PIVOTAL SUPPORT ON OPENING MOVEMENT OF THE JAWS. 